Paint the inside matte white to avoid hot spots. Use translucent plexiglass on top. Putting a piece of glass over that to avoid scratches is a good idea. My current one uses 6 full spectrum CFLs that I found at a lighting supply store. You need full spectrum florescents of some type to get accurate color balance.
Ah yes, I forgot about the FLAT white paint business, very important. 5000K tubes, full spectrum and a CRI(Colour Rendering Index) of at least 90, if you can find them. Otherwise, as close to that number as possible. Here the translucent plexiglass is called Opal, but it's basically the same product, although I've always been of the impression that Opal is slightly more white. Of course you can also use Opal glass, but rather expensive and you still need the plate glass on top to protect your investment. The 1/4" plate glass topping also tends to provide a more rigid surface to work on than the plexiglass alone. When I was building these things I would always ask for 1/4" Salvage plate glass. Perhaps a few slight scratches, but nothing to hinder your viewing and you can save a lot of money.